Lennox Lewis becomes the next undisputed champion by defeating Evander Holyfield, successfully unifiying his WBC belt, with Holyfield's WBA and IBF belt. Lewis would later get stripped of his WBA belt for refusing to challenge John Ruiz

Cruiserweight

Evander Holyfield becomes the first undisputed Cruiserweight Champion by defeating Carlos De Leon, to unify his WBA and IBF belts with De Leon's WBA belt. He relinquished all the belts after moving up to the Heavyweight division.

O'Neil Bell becomes the unifies the his IBF belt with Jean Marc Mormeck's WBA and WBC belt to become the second undisputed champion of the division's history. He is later stripped for not agreeing to fight the IBF's #1 challenger Steve Cunningham.

Hagler is recognized as the inaugural IBF champion, adding the belt to his undisputed status. He loses the IBF and WBA belt recognitions after deciding to fight Sugar Ray Leonard. He loses the WBC belt after losing to Leonard.

Bernard Hopkins becomes the undisputed champion after defeating Felix Trinidad in a Middleweight tournament to successfully unify WBC WBA and IBF belts. He later add the WBO to his undisputed status after defeating Oscar de la Hoya.

Taylor loses his IBF belt for taking a rematch against Hopkins instead of fighting the IBF #1 challenger Arthur Abraham. He officially lost his undisputed status after being stripped of his WBA belt on December 14, 2006

Junior Middleweight

Winky Wright becomes the first undisputed champion of the light middleweight division after unifying his IBF belt with Sugar Shane Mosley's WBA and WBC belts. Wright loses the IBF belt for taking a rematch against Mosley.

Sugar Ray Leonard unifies his WBA with Thomas Hearns's WBC in a legendary showdown to become the first undisputed champ in seven years. Leonard later relinquishes the title after retiring from boxing because of a detached retina in his eyes.

Judah defeats Spinks to become the next undisputed champion. He loses the undisputed status after losing to Carlos Baldomir. Despite being recognized as the "true" welterweight champion, Baldomir wins only the WBC belt because of not paying sanctioning fees for the IBF and WBA . The WBA relinquished Judah as its champion, while the IBF still recognized Judah. Judah later loses the IBF title after losing to Floyd Mayweather Jr..